Main Controlling Factors and Favorable Area Prediction of Deep Carbonate Gas Reservoirs in Puguang Area

doi:10.3969/j.issn.1006-6535.2022.03.004

Abstract

Abstract: The deep marine strata in Puguang Area are the key targets for exploration in northeastern Sichuan. Six hydrocarbon-bearing blocks were discovered with good exploration prospects. such as Puguang and Dawan, With the successive failure of many prospecting wells, it is urgent to improve the re-recognition of characteristics and reservoir formation conditions of gas reservoirs in Puguang Area. Therefore, the types and main controlling factors of gas reservoirs in Puguang Area were analyzed according to logging data, seismic data, core description, analysis and testing data. The results showed that, there were three types of gas reservoirs in the study area: anticline, anticline-lithology, and fault-lithology. The development of gas reservoirs was mainly controlled by four factors. The source rock had high abundance of organic matters, high intensity of gas generation, and wide range of gas generation. In the sedimentary environment of rimmed platform, dolomite such as bioclast and oolite was developed in the reservoir. The dominate reservoir types were porous type, pore-fracture type and vuggy type, with sound physical properties (the average porosity was 8.20% and the average permeability was 79.50 mD). The lithology of the cap rock was mainly gypsum-salt rock, with an average thickness of more than 290 m and a wide distribution range. There were five large NE-trending faults and multiple NW-trending faults which constituted the main channel system for oil-gas migration in Puguang Area. On this basis, four types of favorable areas for accumulation were defined, with the most favorable zones located in Puguang, Maoba and Dawan blocks. The study can provide theoretical guidance and technical support for the further exploration and development of deep carbonate reservoirs in Puguang Area.

Key words: Puguang Area, deep carbonate rocks, hydrocarbon reservoir type, main controlling factors, favorable area for accumulation

CLC Number:

TE122.2

Yu Jiwang, Pang Xiongqi, Zheng Dingye, Wang Xuejun, Xiao Huiyi, Zhang Pengwei, Zhuo Seqiang, Li Hongyu. Main Controlling Factors and Favorable Area Prediction of Deep Carbonate Gas Reservoirs in Puguang Area[J]. Special Oil & Gas Reservoirs, 2022, 29(3): 28-35.

References

[1] 马永生,黎茂稳,蔡勋育,等.中国海相深层油气富集机理与勘探开发: 研究现状、关键技术瓶颈与基础科学问题[J].石油与天然气地质,2020,41(4):655-672, 683.
MA Yongsheng,LI Maowen,CAI Xunyu,et al.Mechanisms and exploitation of deep marine petroleum accumulations in China:advances,technological bottlenecks and basic scientific problems[J].Oil & Gas Geology,2020,41(4):655-672,683.
[2] 白国平,曹斌风.全球深层油气藏及其分布规律[J].石油与天然气地质,2014,35(1): 19-25.
BAI Guoping,CAO Binfeng.Characteristics and distribution patterns of deep petroleum accumulations in the world[J].Oil & Gas Geology,2014,35(1):19-25.
[3] 李剑,佘源琦,高阳,等.中国陆上深层—超深层天然气勘探领域及潜力[J].中国石油勘探, 2019,24(4):403-417.
LI Jian,SHE Yuanqi,GAO Yang,et al.Onshore deep and ultra-deep natural gas exploration fields and potentials in China[J].China Petroleum Exploration,2019,24(4):403-417.
[4] 马永生,蔡勋育,赵培荣.元坝气田长兴组—飞仙关组礁滩相储层特征和形成机理[J].石油学报,2014,35(6):1001-1011.
MA Yongsheng,CAI Xunyu,ZHAO Peirong.Characteristics and formation mechanisms of reef-shoal carbonate reservoirs of Changxing-Feixianguan Formations,Yuanba Gas Field[J].Acta Petrolei Sinica,2014,35(6):1001-1011.
[5] 马永生,蔡勋育,郭彤楼.四川盆地普光大型气田油气充注与富集成藏的主控因素[J].科学通报,2007,52(增刊1):149-155.
MA Yongsheng,CAI Xunyu,GUO Tonglou.The main controlling factors of oil and gas injection,enrichment and accumulation in the Puguang large gas field in the Sichuan Basin[J].Chinese Science Bulletin,2007,52(S1):149-155.
[6] 马永生.四川盆地普光超大型气田的形成机制[J].石油学报,2007,28(2):9-14,21.
MA Yongsheng.Generation mechanism of Puguang Gas Field in Sichuan Basin[J].Acta Petrolei Sinica,2007,28(2):9-14,21.
[7] 冯冲.川东北二叠系—三叠系碳酸盐岩层系源岩与储层发育机理与分布[D].北京:中国石油大学(北京), 2013.
FENG Chong.Development mechanism and distribution of source rocks and reservoirs of Permian-Triassic carbonate facies in northeastern Sichuan[D].Beijing:China University of Petroleum(Beijing),2013.
[8] 庞雄奇,姜振学,黄捍东,等.叠复连续油气藏成因机制、发育模式及分布预测[J].石油学报,2014,35(5):795-828.
PANG Xiongqi,JIANG Zhenxue,HUANG Handong,et al.Formation mechanisms,distribution models,and prediction of superimposed,continuous hydrocarbon reservoirs[J].Acta Petrolei Sinica,2014,35(5):795-828.
[9] 于建宁,邹华耀.川东北清溪场裂缝型气藏形成过程分析[J].石油天然气学报,2012, 34(1):31-34,40.
YU Jianning,ZOU Huayao.Gas reservoir accumulation process of Qingxichang Fractured Reservoir in northeastern Sichuan Basin[J].Journal of Oil and Gas Technology,2012,34(1):31-34,40.
[10] 魏立新,胡明姣.普光气田南部海相地质综合研究[J].内江科技,2011,32(2):130-131.
WEI Lixin,HU Mingjiao.Comprehensive study of marine geology in southern Puguang Gas Field[J].Neijiang Science & Technology,2011,32(2):130-131.
[11] 唐大卿,陈新军,张先平.川东北宣汉-达县地区断裂系统及构造演化[J].石油实验地质,2008,30(1):58-63.
TANG Daqing,CHEN Xinjun,ZHANG Xianping.Fault systems and their tectonic evolution in Xuanhan-Daxian Area,the northeastern Sichuan Basin[J].Petroleum Geology & Experiment,2008,30(1):58-63.
[12] 马永生,蔡勋育,李国雄.四川盆地普光大型气藏基本特征及成藏富集规律[J].地质学报,2005,79(6):858-865.
MA Yongsheng,CAI Xunyu,LI Guoxiong.Basic characteristics and concentration of the Puguang Gas Field in the Sichuan Basin[J].Acta Geologica Sinica,2005,79(6):858-865.
[13] 秦建中,付小东,腾格尔.川东北宣汉-达县地区三叠—志留系海相优质烃源层评价[J].石油实验地质,2008,30 (4):367-374, 381.
QIN Jianzhong,FU Xiaodong,Tengger.Evaluation of the excellent Triassic to Silurian marine hydrocarbon source rocks in Xuanhan-Daxian Area of northeast Sichuan Basin[J].Petroleum Geology & Experiment,2008,30(4):367-374,381.
[14] 蒋裕强,邓虹兵,易娟子,等.开江-梁平海槽西侧飞仙关组不同类型鲕滩储层特征及其控制因素研究[J].特种油气藏,2020,27(1):17-24.
JIANG Yuqiang,DENG Hongbing,YI Juanzi,et al.Properties of different oolitic beach reservoirs in the Feixianguan Formation of Kaijiang-Liangping Trough[J].Special Oil & Gas Reservoirs,2020,27(1):17-24.
[15] 魏水建,冯琼,冯寅,等.川东北通南巴地区三叠系膏盐岩盖层预测[J].石油实验地质, 2011, 33(1): 81-86.
WEI Shuijian,FENG Qiong,FENG Yin,et al.Prediction of triassic gypsum cap rocks in Tongnanba region of northeast Sichuan Basin[J].Petroleum Geology & Experiment,2011,33(1):81-86.
[16] 陈建平,李伟,倪云燕,等.四川盆地二叠系烃源岩及其天然气勘探潜力(二)——烃源岩地球化学特征与天然气资源潜力[J].天然气工业,2018,38(6):33-45.
CHEN Jianping,LI Wei,NI Yunyan,et al.The Permian source rocks in the Sichuan Basin and its natural gas exploration potential(Part 2):geochemical characteristics of source rocks and latent capacity of natural gas resources[J].Natural Gas Industry,2018,38(6):33-45.